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Adaptive Boundary-scan chain for different packages

Publishing Venue

The IP.com Prior Art Database

Abstract

This paper describe an adaptive Boundary-scan chain architecture which automatically bypass Boundary-scan cells whose I/O are not bonded out (referred as “conditional I/O”) in small packages. A detection circuit to distinguish conditional I/O and their boundary scan cells is introduced so that boundary scan chain can be self adaptive for different packages.

Country

China

Language

English (United States)

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Adaptive Boundary-scan chain for different packages

Abstract – This paper describe an adaptive Boundary-scan
chain architecture which automatically bypass Boundary-scan cells whose I/O are
not bonded out (referred as “conditional I/O”) in small packages. A detection
circuit to distinguish conditional I/O and their boundary scan cells is introduced
so that boundary scan chain can be self adaptive for different packages.

Multiple
packages with different features may be applied for same integrated circuit
design. Some features and corresponding I/O are invisible (not enabled) on
certain packages such as smaller packages.

To
meet high boundary-scan coverage, all boundary-scan cells, including those
whose I/O are not bonded out in small packages, need to be kept on chain for
full package. While, for smaller packages, problem arises about how to handle boundary-scan
cells whose I/O are not bonded out. To save cost and simplify design, IC (integrated
circuit) design doesn’t want to power the un-bonded I/O internally, and IC
device customers don’t want to power them on circuit board with extra costs.

We
introduce an adaptive boundary-scan chain architecture that automatically
bypasses boundary-scan cells whose I/O are not bonded out (referred...